TW200425917A - High capacity absorbent structure and method for producing same - Google Patents

Abstract

An absorbent core for use in an absorbent article such as a diaper, training pant, feminine hygiene product, or an incontinence product includes a stabilized first absorbent layer and a second absorbent layer that contains a superabsorbent and absorbent fibers treated with a non-fugitive densification agent.

Description

200425917 发明 Description of the invention: [Technical field of the invention] The present invention is a kind of absorbent product that can be used in two or more layers of raw cotton, diapers, toilet training diapers, adult diapers, sanitary pads , Sanitary napkins, hand pads, kanji, breastfeeding, and other products designed to absorb liquids. [Prior art] ~ This product is a thin, highly absorptive absorbent core suitable for absorbent products, and has suitable stiffness. . Surgical pads, sanitary napkins, thin sanitary napkins, adult disposable pads, diapers, diapers, and other disposable products are designed to directly touch the body of the manufacturer in order to absorb body fluids , Such as menstrual blood, money, urine, or other body secretions. ”, Users of absorbent products include women during the menstrual period, babies, adults who are suffering from incontinence such as children, etc. This—large categories of users have different needs for absorbency, and a large series of products have been developed to meet consumer needs for absorbent products. The needs of users with incontinence and menstruating women are very different, so products that are commercially available for women's menstrual periods may not meet their special needs. The products used by most incontinent users (such as: Shibei children, such as children during training sessions) need to be able to absorb and retain urine. Women's physiological products are specially designed to absorb and retain menstrual blood. It is not necessarily a super absorbent body. Super absorbent body can retain a large frequency of body fluids, such as urine, but =% can hinder absorption by A. Without the help of super absorbent body, many women High-volume absorbency required by incontinence people. The incontinence article contains super-absorbent body A: Let liquid urine lock in and make the wearer feel dry. There are many incontinence users. It releases a small amount of urine, so it will be worn longer. In addition, including babies, such as the training period? *, And incontinent adults, you can ride out a large amount of urine, each time up to ^ public $ RANGE: There seems to be a need for high-volume absorbent products. The reason why many adult incontinence people use thin _1 or super sanitary napkins is because most incontinent products are not as thick as the month (| Person light 4 and not easy to find for others. Incontinent product users have very Strong C: \ Eunice 2004 \ PK-001-0S \ ΡΚ-ωΊ-0884 \ ΡΚ-ωΐ-0884-Tsuei.doc 200425917, Chang is reluctant to let others notice that they have such problems. Therefore, there is a need, For thinner loss, σπ can be provided, and a wide range of absorption volume can be provided to meet the special needs of users. Based on the above considerations, it is necessary to be able to produce _ kinds of relatively cheap, relatively thin loss, incontinence paper pants, Or fine _ sanitary cotton, whose thickness is less than 1G silk, even up to 7 ^ 8

House rice, better than 5 mm, and at least enough to absorb 20 grams to more than 1 200 grams of urine. J Today ’We have invented a cheaper, thinner absorbent product that meets these requirements. The absorbent product contains an absorbent core, which is formed from two or more layers of raw materials, and at least one of them contains a super absorbent body. [Summary of the Invention] Lu / Simply, the present invention is an absorbent core formed in two or more layers that can be used in absorbent products. Can paste this_ Absorbent products of the absorbent core include at least: Incontinence nappies, thin sanitary napkins, diapers, toilets. Diapers, adult diapers, sanitary pads, sanitary napkins, hand pads, turtle watching, Nursing pumps, and other products designed to absorb liquids. The absorbent core may be formed of two or more layers of material to prevent inadvertent side leakage. The absorbent product used may include a permeable bodyside liner, a water-impermeable barrier, and an absorbent core between the liner and the barrier. Products made with the absorbent core of the present invention are more resistant to deformation and more intact during use. The absorbent core includes at least a first absorbent layer and a second absorbent layer, at least one of which may include a super absorbent body. The first absorbent layer includes a security material that may be made of a superabsorbent body. The second absorbent layer contains a superabsorbent layer and absorbent fibers, which may be treated with a durable density enhancer first. The density of the second absorption layer may be higher than that of the first absorption layer. In the following description and patent application, the so-called "non-fiigitive densification agent" means a substance that is less volatile than water, can form hydrogen bonds or other bonds with the fiber, or with the fiber. There is a certain affinity between them, which can reduce the external force required to increase the density of such fiber clumps or absorbent layers. Unless otherwise stated, the percentages mentioned in the following descriptions and subsequent patent applications are percentages by weight. 6 〇 \ Eunice 2004 \ ΡΚ-00Ί-08 \ ΡΚ-001-0884 \ ΡΚ-00Ί-0884-Tsuei.doc 200425917 The specific objective of the present invention is to propose an absorbent product with two or more layers of material The absorbent core can retain body fluids discharged from the body. More specifically, the object of the present invention is to provide a thin or thin incontinent, or to collect thin liquids, and to provide a method for making such products. Another object of the present invention is to provide an absorbent core that is more resistant to deformation and maintains its integrity and shape when in use. Another embodiment of the present invention is to propose an absorbent product having a thickness of less than 1 Gm, or even less than 7 to 8 mm, or most likely less than 5 mm. The present invention also has-an embodiment is-a thin product, in which the absorbent core is composed of two or more layers' and at least one layer contains a super absorbent body. Other embodiments of the invention provide a method of manufacturing an absorbent core. In this embodiment, it is proposed to manufacture light, thin, high-absorbent absorbing materials, and to reduce the damage of the super-absorbent body in the manufacturing process. In addition, one embodiment of the present invention can provide an absorbent product which is easy to manufacture and reasonably priced, and is thin and light. Other implementations of the present invention, Shun Yun, are more obvious to those in the industry after referring to Xia Shun_Pi Private. [Embodiment] First, referring to FIG.- ', there is an absorbent product, which represents a thin incontinence pad or a thin sanitary napkin. The design of the absorbent product should be fixed to the inner surface of the user's underpants and designed to collect and retain urine inadvertently exuded by the body. Absorptive product (1 Gorge long structure, has a central long axis X rhyme and-towel central horizontal axis y_y. Absorbent products ⑽ also has a vertical pumping ZZ as shown in the second figure. Absorbent products ⑽ relatively It ’s thin, about only a few millimeters thick. In addition, in terms of-appearance is more like-clothing, for example, absorbent products made of diapers, children such as piercing, and diapers can be- Ordinary underpants-worn or attached to the body, and then fixed with tape or ring-shaped materials commonly used in paper diapers, etc. "Thin" here refers to absorbent materials (1 〇) The thickness is less than 10 mm, even up to 7 to 8 mm, and more preferably less than 5 mm. The liquid retention of the absorbent product ⑽ can absorb up to 20 g to 1 200 g of urine Take 7 c: \ Eunice 2004 \ ΡΚ-ΟΟί-08 \ ΡΚ-Ο0Ί-Ο884 \ PK-OOl-0884-Tsuei.doc 200425917. The actual amount of liquid retention required depends on the product and the user, and can be based on this The invention is adjusted to meet the needs of various products and customers. Absorbent products (ίο) bags There is a water-permeable inner liner (12), a water-impermeable separator (14), and an absorbent core (15), which is placed between the inner liner (2) and the separator (14). The inner lining (12) is to be in contact with the wearer's body. The inner lining of the body may be made of a woven with small holes, or may be composed of maggots that allow body fluids (especially silk) to pass through. 12) It is also made of natural or man-made fibers. Suitable materials include at least: Polyester, polypropylene, polyethylene, nylon, or other fibers that are bonded and combed for thermal bonding. Other polyolefins, such as copolymers of polypropylene and polyethylene, linear low-density polyethylene, a film layer with fine pores, and mesh materials are also well known. Applicable here The material is a soft, wettable polypropylene spin-drilled web monopolymer with a basis weight ranging from 13 grams per square meter (gsm) to about 27 gsm. Another suitable material is porous Thermoplastic film. Body-side lining (12) suitable raw material is also made of polypropylene / polyethylene binary composite fiber in parallel bonding or Spunbond web with a core / sheath structure. This spunbond web may contain 1% to 6% titanium dioxide dye to form a clean appearance. Polypropylene webs suitable for the present invention may have 13 to A basis weight of 40 gsm. A more suitable basis weight may be between 15 and gsm. The thickness of the body-side lining Q2) is between 0.1 mm and 1.0 mm. It is to be noted that the body-side lining (12) may also be coated with a surface active agent by coating, spraying, or other methods to make it hydrophilic. The "hydrophilic" here means that the body-side liner (12) has a very southern affinity to water 'and the contact angle is less than 90 degrees. The inside body profile (12) may also have a hydrophilic nature since it is unhealthy. If the body-side lining (12) is made of a hydrophilic material, the body fluid can flow quickly. The body-side lining (12) may also be embossed to enhance the aesthetic appearance of the absorbent material (10). The liquid-permeable liner (12) and the liquid-permeable separator (14) are combined to surround the absorbent core (16). The lining (12) and the separator (14) may be cut, glazed, and made into a common outer edge (18). Next, the inner liner (12) and the separator (14) are bonded face to face to form an absorbent product (10) having a peripheral seal or a trim (20). The width of the edging thus obtained can reach 5 mm. The lining (12) and the spacer (14) may be of any suitable shape. But generally speaking, both will be 8 C: \ Eunice 2004 \ ΡΚ-00Ί-08 \ ΡΚ-00Ί ^) 884 \ PK-OOi ^ 884-Tsuei.doc 200425917 is similar to a dog bone shape, a drip shape, a 7_ shape The race track seal is -β liner (12) and isolation # (14) may be fitted at the edge or military M "two 70 whole absorption products (1G). Or, the inner liner (12) and the separator (14) ) Also stable knots and slabs are heated with |, such as ultrasound or other means to form a liquid-permeable isolation > 1 (14) 4 # is to allow air or vapor to flow out of the absorbent product. Will block the passage of body fluids (such as urine). If necessary, the separator ㈣ can also use a material to completely isolate vapor and liquid. The material suitable for the separator ㈣ is a polymer knee membrane with a finely embossed pattern ' For example, polyethylene or polypropylene. Binary composites can also be made. One of the suitable materials is polyethylene matte film. The separator (14) may also be a laminate of multi-layer films or spin-drilled non-woven fabrics. In a specific embodiment, the separator (14) contains a polyethylene film whose thickness is from 0.1 mm to 1.0 mm. Isolation (14) The width may be from 50 mm to 32 mm, or from 60 mm to 120 mm. It should be noted that products such as diapers, panties, tights, and care pads are more clothing-like products. The free-standing inch must be appropriately sized to meet its needs. We can also introduce a superabsorbent layer (22). The role of this superabsorbent layer (22) is to absorb 3 (16) quickly before it can be absorbed. Absorbs and retains urine. This superabsorbent layer can be made of many materials. Two materials suitable for superabsorbent layers include wrinkled composite spunbond or carded bonded fabric. If A super absorbent layer is used, which has a basis weight of about 20 gsm to 120 gsm and a thickness of 0.1 mm to 5 mm. The following US patents can learn how to make a super absorbent layer: US Patent No. 5,364,382; No. 5429629; No. 5486166; No. 5490846; The relevant parts listed here are for reference only. As shown in the second figure, the absorbent product (10) has an absorbent core (16) located in the excess absorbent layer (22) and can be Between the liquid-permeable separators (14). A receiving layer (22), the absorbent core (16) is located between the body-side liner (12) and the liquid-permeable separator (14). The absorbent core (16) includes a first absorbent layer (24) and The second absorption layer (26). 9 C: \ Eunice 2004 \ PK ~ 001-〇8 \ PK-Q〇l ^ 〇S84 \ PK-001-0884-TsueiJoe 200425917 The second absorption layer (26 runs (24) Zaer is lined near the "top end" of the product (10), and m is convenient. The inner profile (12) in the second picture is called the absorbent layer (face to face). The first-absorptive layer (24) may be directly in contact with the second absorbent, and the first-absorptive layer (24) may be adhered to the second-absorptive layer (26). (If the situation is the use of adhesive) to ensure that the two are in close contact and the liquid is easy to report? Now μΓ said that ^ and the second absorption layer (24), (26) may directly touch each other, or may be

I's tissue or cloth. Some manufacturers prefer to cover the body I containing the superabsorbent to avoid the superabsorbent from overflowing from the final product. In the same way, absorption === #: ^ Butterfly touch, Na "Editing the mouth mouth again", "," (the absorption layer (24) is also made of a dog bone with a border). You can also use it ★ His noise is rectangular, hourglass-shaped, oval-shaped, lion, asymmetrical on both sides, and so on. The two narrowest griffins (24) near the horizontal axis (y_y) are quite suitable for better wearing comfort. Trapezoidal or _end by __ shapes are suitable for men.

The -absorptive layer (24) is a stabilizer layer including absorbent fibers and may also contain a super absorbent body. The first-absorbing layer of the present invention is sufficient as a stabilizing layer for the entire product. The so-called "stabilized absorbent" here refers to an absorbent body or layer, which contains an adhesive or other raw materials added together with an absorbent material, such as a mixture of cotton wool and super absorbent body If such a stabilization layer is used, an absorbent substrate with a dry strength of about 6 Newtons / 5 cm or more and a house strength of 2 Newtons / 5 cm or more can be provided. It should be noted that the above-mentioned adhesive should be uniformly added to the mixture of absorbent materials, or it should be added between the absorbent mixtures in a layered structure. In this way, the adhesive can bond the above-mentioned absorbent substrates together in a dry or wet state. Some stable absorbent layers, such as foam or multilayer adhesive (produced by Kimberly-Clark Corp., KRoswell, GA), do not require additional procedures to obtain the required tensile strength. The first absorbing layer (24) may be constituted in any number as known in the art. For example, the first absorbing layer 10 C: \ Eunice 2〇〇4 \ PK-001-08 \ PK-Wl-0884 \ PK-〇〇1-〇884-Tsuei.doc 200425917 may include a layer of "air flow into "Nonwovens, multilayer bonded nonwovens, sprayed fibers, carded bonded webs, laminated tissue products, absorbent films, foams, airlaid combinations, etc." or a mix of the above materials . The first absorbent layer may also contain the wet-laid stabilizer layer described in the ptc W098 / 51251 file, and then equipped with a super absorbent body as required, or as described in the PCTW098 / 24392 file, both of which are for reference only. use. In a specific embodiment, the first absorbent layer (24) may be an airlaid filler composed of hydrophilic fibers, a superabsorbent material, and an adhesive. The so-called "air-laid" here means that all the different kinds of components are sent out by air flow and mixed uniformly, or formed into a layered structure and then bonded into one, so as to make an absorbent material. For example, it contains at least a combination of Puwei Weiwei, rayon, super absorbent, and viscous materials. Adhesive materials are usually synthetic viscose fibers or latex. There are a number of commercially available procedures for making airlaid absorbent structures. For example, the 'airlaid process' can be a program from DanwebCorp. (Risskov, Denmark) or M & J Forming Technologies (Horsns, Denmark). The airlaid manufacturing process can make the material uniform, and artificial fibers and adhesives can be added to stabilize the absorbent product. As a stabilizer, the adhesive reduces the degree of collapse of the finished product structure in the wet state and maintains a low density in the saturated state. In other words, the adhesive helps the absorbent web stay intact even when it absorbs a certain amount or even reaches saturation. There are many types of wettable, hydrophilic fibrous materials that can be used for the fibrous component of the first absorbent layer (24). These suitable fibers include at least: organic fibers composed of natural wettable raw materials, such as cellulose fibers; man-made fibers composed of cellulose or its derivatives, such as cellulose fibers; Inorganic vitamins composed of wet materials, such as glass fibers; synthetic fibers composed of wettable thermoplastic polymers, such as some polyester or polyamide fibers; and non-wettable Synthetic fibers made of thermoplastic polymers, such as polypropylene fibers, can be made hydrophilic by other methods. For example, it is treated with silicon dioxide, or it is treated with a raw material with a suitable hydrophilic group and not easily separated from the fiber, or a sheath is added to the fiber that cannot be wetted and hydrophobic before and after the fiber is pumped. For the purpose of the present invention, the above-mentioned plurality of fibers may be mixed. As shown in the third figure, the first absorbing layer (24) is a second group of fibers formed by mixing a first group of fibers (28) and an adhesive (30), and a superabsorbent (32 ) To form a stable, air-laid absorbent structure. The first group of fibers (28) may be cellulose fibers, such as short fibers, high 11 C: \ Eunice 2004 \ PK-001 -08 \ PK-〇〇7 ^) 884 \ PK-001-0884-Tsuei.doc 200425917 Danny and hydrophilic pulp fibers. The first group of fibers (28) may consist of 100% softwood fibers. Preferably the first group of fibers (28) is also southern pine kraft pulp fibers. One of the materials suitable for the first group of fibers (28) is Weyerhaeuser NB 416 pulp fiber, produced by Weyerhaeuser Company, Federal Way, WA. In addition, the first group of fibers can also use the artificial fibers or synthetic fibers' listed previously, or the first group of fibers (28) may be a combination of the above materials. The adhesive part of the first absorbent layer (24) may be a liquid adhesive such as a chemical paint or latex, and can be added to the first absorbent layer by spraying, foaming or laminating. Preferably, the adhesive portion of the first absorbent layer (24) may further include a second group of fibers (30). The second group of fibers (30) may be composed of artificial viscose fibers. Man-made adhesive fibers are available from a number of companies. For example, trevira 255 2.2 decitex 3 mm Lot 1663, produced by Trevira GmbH &Company; KG, its correspondence address is Max-Fischer-Strasse 11, 86397 Bobingen, Deutschland. Another supplier is Fibervisions a / s, whose correspondence address is Engdraget 22, Dk_6800 Varde, Denmark. Another supplier is KoSa, which has a mailing address of R 0 · Box 4, Highway 70 West, Salisbury, N.C28145. The second group of fibers (30) are preferably binary synthetic fibers having a polyester core and a polyethylene sheath. Alternatively, the second group of fibers (30) may be a composite fiber having a polypropylene inner core and a polyethylene outer sheath. The polypropylene sheath may have a high density, or a low density, or a linear low density polyethylene. An activator such as maleic anhydride may be added to the polymer. The length of the fibers constituting the second group of fibers (30) is longer, and the Denny number is also lower than that of the fiber bundles constituting the first group of fibers (28). The length of the fiber (30) may be between 3 mm and about 6 millimeters, or more. A fiber with a length of 6 mm is suitable. The denier number of the fiber (30) is about 20 or less. The fiber (30) must be unaffected by moisture and may be crimped or uncurled. Curled fibers are more suitable because they are easier to handle. As mentioned above, the first absorbing layer (24) may include a super-absorbent body (32). The so-called super absorbent means that each gram of absorbent material can absorb more than 10 grams of water. Superabsorbents (32) are usually small particles, but superabsorbents in the form of fibers, flakes, or other shapes can also be used. An example of a suitable superabsorbent (32) is FAVOR SXM 880. FAVOR SXM 880 is available from Stockhausen, Inc., located at 2408 Doyle Street Greensboro, N.C. 27406. Other similar superabsorbents, such as FAVOR SXM 9543 or FAVOR SXM 9145 are also suitable and can be purchased from Stockhausen, Inc. 12 C: \ Eunice 2004 \ ΡΚ-ΟΟί -08 \ ΡΚ-001-0884 \ Ρ K-ΟΟί -0884-Tsuei.doc 200425917 The weight percentage of the super absorbent body (32) in the first absorbent layer (24) It can reach 0% to 60%. The content of the super absorbent body (32) in the first absorbent layer (24) depends on the composition of the super absorbent body (32) and the function of the absorbent product (10). For example, an absorbent product may need to reach an extremely south absorption volume, so a super absorbent body may be required in the first absorption layer (24). Alternatively, if the primary function of the first absorption layer (24) is to prevent urine staining, promote the absorption of liquids, or to form a stabilized layer with a very low basis weight to reduce costs, then the first absorption layer ( 24) It is not necessary to include a super absorber. The ratio of the respective components (28), (30), and (32) of the first absorption layer (24) is variable. However, we have found that the following combination ratios apply to thin absorbent products (10). The first group of fibers (28) can occupy approximately 30% to 95% of the weight of the first absorbent layer (24). The second group of fibers (30) can occupy approximately 5% to 40% of the weight of the first absorbent layer (24). The superabsorbent body (32) can occupy about 0% to 60% of the weight of the first absorbent layer (24). We also found that if the first absorbent layer (24) contains 50% to 95% of the first group of fibers (28), about 5% to 20% of the second group of fibers (30), and about 0% to 4%. % Super absorbent body, suitable for absorbing and retaining urine. The first group of fibers (28) in the first absorbent layer (24) must occupy a considerable proportion compared to the second group of fibers (30). The large number of fibers (28) of the first group can reduce the cost of the first absorbent layer (24) on a large scale. The first group of fibers (28) also ensures that the absorbent product (10) has sufficient absorption. For example, cellulose fibers (28) ' like tortoise pulp fibers are generally cheaper than artificial adhesive fibers. In order to achieve good product performance, the second group of fibers (30) should occupy at least 4% of the weight of the first absorbent layer (24) to ensure that the first absorbent layer (24) has sufficient resistance whether dry or wet. Zhang intensity. The basis weight of the first absorbing layer (24) must also be between 60 gsm and 800 gsm. To be clear, the basis weight of the first absorbing layer (24) is preferably between 100§81111 and 600§81111. More specifically, the basis weight of the first absorbing layer (24) is preferably between 100 gSm and about 200 gsm. The first absorbing layer (24) is in a nearly dry state, and then subjected to a hot embossing treatment of about 14 to 160 degrees Celsius for 8 to 1 G seconds to form a density of about a () 5 g / em3 to G4g / em3 . To be clear, the first absorbing layer (24) is preferably in a state of being nearly dry and having a density of about 0.6 gW to about 22 g / cm3. To put it more clearly, the -Wei layer (24) is preferably embossed to a state of near money with a density of about 0.07 g / cm3 to (UgW). The compression treatment of the first absorbing layer (24) helps Manufacture thin absorbent products (10). 13 C: \ Ettnice 2004 \ PK-Wl-08 \ PK-O01-0884 \ PK-001-0884-Tsuei.doc 200425917 Take a stable material with sufficient tensile strength, Rolled into a bundle for further processing in the machine. In addition, sufficient dry and wet tensile strength helps this absorbent product (10) resist deformation and improve its integrity during use. We can change the adhesive The composition of the fiber or the composition of the viscose fiber, adjusting the conditions of hot embossing, adjusting the density value reached by the compression of the fiber, or using any technique known in the industry to obtain the required tensile strength. We found The tensile strength of the first absorbing layer (24) can be at least 6 Newtons (6N / 50m0) per 50 mm. To be clear, the tensile strength of the first absorbing layer (24) should be at least 18N / 5 More specifically, the tensile strength of the first absorbing layer (24) should preferably be at least 25N / 50mm. ^ The tensile strength of the raw material It can be measured with the Microcon II from Instron Corp. (Canton, MA.). This instrument is first reset to the center of the upper clamp with a 100-gram pair, and is suspended vertically without obstruction to correct the reading. The pull used The extension unit is a 5 kg electric calibration self-sensing device. The measured data will be displayed on the Microcon instrument. This procedure is performed in a standard environment, that is, the temperature is about 23 ° C and the relative humidity is 50% Take a 5 cm by 15 cm rectangular sample, measure the weight and compress it to the required density. Then multiply this dried sample by 1 inch (2.54 cm) by 3 inches (7.62 cm), covered with rubber The pneumatic grip is properly placed. The standard length is 10 cm, and the crosshead extension rate is 250 mm / min. The crosshead rate refers to the speed of the upper clamp before the sample breaks. The so-called "tensile strength" ”Is the maximum load when the sample breaks, that is, the force required to permanently stretch or break the sample (in grams). The tested material is subjected to tensile strength measurements at the same time when it is dry and 100% saturated. Water absorption 100 % Saturation Tensile strength, is first dried sample is placed in a concentration

More than 0.9% of saline solution for more than 20 minutes, then take out the sample and place it on the fixture, and measure the tensile strength according to the aforementioned method. The N first absorbing layer (24) is preferably a stable air-laid absorber, which can provide the integrity and tensile strength in the tide state, and also improve the dispersion of the liquid. The first absorbent layer (24) of the present invention typically has a dry strength of 6N / 50 legs and a wet strength of at least 2N / 50mm. The first absorbing layer (24) has a certain thickness as long as the total thickness of the absorbent product (10) is about 10 mm or less. The total thickness t1 of the absorbent product (10) is preferably between 7 and 8 mm, or one step closer. The thickness of the absorbent product (10) is less than about 5 mm. In other words, the thickness of the first absorbing layer (24) only needs to allow the thickness t2 of the absorbing core (16) to be between 2 mm and 8 mm, or more 14 C: ^ Eunic ^ m \ PK ^ 1 ^ 8 \ PK-007-0884 \ PK-0〇J-〇884-Tsud.d〇c 200425917 The step is less than 4 mm. Looking back at the second figure, in one embodiment, the configuration of the absorbent core is to place the second absorbent layer (26) #near the separator (14) and place it vertically below the first absorbent layer (24). However, the absorbent core (16) can be arranged in any suitable manner, as long as at least part of the first absorbent layer (24) is vertically above the second absorbent layer (26) during use. Alternatively, as shown in the seventh figure, the first absorption layer (2 sentences may also be located vertically below the second absorption layer when in use. The second absorption layer (26) may be located perpendicular to the first absorption layer (24) Underneath, but above another absorbent layer similar or identical to the first absorbent layer (24). If helpful, the first absorbent layer (24) and the second absorbent layer (26) can be adjacent to it in any way Layered configuration, whether it is the same material or made of different raw materials. As long as it is arranged as required, the cutting size, shape, or space occupied by each layer need not be exactly the same. The second absorbent layer (26) contains a Treated absorbent fiber. As mentioned above, the "irreversible density enhancer" is one that is less volatile than water, can form hydrogen bonds or other bonds with the fiber, or has a certain affinity with the fiber This can reduce the external force required to increase the density of the fiber mass or the absorbent body. Therefore, the second absorbent layer has tensile strength when dry but almost no tensile strength in the wet state. The second absorbent layer (26 ) Also includes a super absorbent, which and the first The absorbent layer (24) may be the same or different (assuming that there is also a super absorbent body in the first absorbent layer (24)). If a super absorbent body is used in the first absorbent layer (24), then the second absorbent layer The super absorbent used in the layer (26) is preferably the same as the super absorbent in the first absorbent layer (24). The weight percentage of the super absorbent in the second absorbent layer (26) can reach ι〇 〇 / 〇 to 70%, preferably between 30% and 60%, and more preferably from 40% to 55%. The content of super absorbent depends on the absorption capacity designed by the absorbent core of the absorbent product. As mentioned above, the absorbent fibers used in the second absorbent layer (26) are treated with a durable density enhancer. Therefore, the external force added to the second absorbent layer (26) to compress to the required density is larger than that When processed by this density enhancer, it should be low, the target density is about 0.15g / cm3, and it is better to be between 0.25g / cm3 and 0.5 g / cm3. The density of the second absorption layer depends on the required product thickness The requirement is also related to the content of the super absorbent. For example, if the content of the super absorbent is about 50%, the thickness is usually 0.3 g / c m3 is suitable. Or, if the content of the super absorbent is low, for example, it is about 30%, then the thickness is preferably 0.2 g / cm3. In addition, if only 15% of the super absorbent, 15 C : \ Eunice 2004 \ PK-001-08 \ PK-Wl-0884 \ PK-OQi-〇884-Tsim.doc 200425917 The thickness of the absorption layer is preferably lower, about G15gW is enough. Yes-a kind of processed by enhancer With suitable absorbent fibers, this densified U 'and the density is 016 gW under 50 PS1 force. This pulp can be purchased from Weyerhauser Corporation under the trade name of nem16. Oral sustained reading enhancers can be found in U.S. Patent No. ⑽Milk, the relevant part of which is provided here for reference only. In general, durable density enhancers are those that enhance the benefits of polymerization and non-polymerization. Take those that have at least a functional group that can form hydrogen or covalent bonds, or have a considerable affinity with the fiber.

Polymerized density increase may include polymerized density increase molecules, whose degree enhancer molecules have at least hydrogen bond functional groups or covalent bond functional groups. Combination enhancers are more likely to include units that repeatedly appear in f, which occur repeatedly All polymerized units have the above-mentioned functional groups, even if the attack is not a necessary condition for the effectiveness of the rush-enhancing agent. According to the present invention, the consumption of the polymerized Weifanggang includes the following: polyethylene glycols (especially poly-propylene glycol) ), Polynuclears, polyship salts, polyisopropyl alcohols such as dibasic, amines, polyamines, polysulfonic acids, polyacids, and combinations thereof. Practical examples of these compounds are as follows ： Polyethylene glycol (polyethylene glycol) and polyethylene glycol (PPE); Poly-polyols include polycaprolactone and polycaprolactone, and polyisocyanates include polyacrylic acid (PAA) and polymaleic anhydride; polyamines include polypropylene amines or peptides; polyamines include polyethyleneimine and polyethylene glycol; polysulfonic acid or polyxanthates include With sodium polystyrene sulfonate or poly (2-acrylamide methylpropanesulfonic acid) Or the above-mentioned copolymers (such as polypropylene glycol / polyethylene glycol copolymers). Polymerized density enhancers usually have units that appear repeatedly. The units that appear repeatedly may form the main chain of the compound, such as in a polypeptide. It is repeated that the polyamine unit constitutes the peptide backbone. The unit that appears repeatedly may also be a unit other than the main chain, such as an acrylic unit that appears repeatedly. If so, the units that appear repeatedly may be the same or different The density enhancer has a functional group that can form a hydrogen bond or a covalent bond with a superabsorbent, and also has a functional group that can form a hydrogen bond with the fiber. Here, the so-called "polymer" refers to five or more identical or A huge molecule made up of distinct units (polymer monomers). Polyamines are polymers containing amine functional groups, and polyamines are polymers containing amino functional groups. Each density enhancer has a functional group that can form hydrogen bonds or covalent bonds, and each density enhancer may appear repeatedly in its unit 16 C: \ Eunice 2004 [ΡΚ-00Ί-08 \ ΡΚ-001-0884 \ ΡΚ-00Ί-0884-Tsuei.doc 200425917 U-composite monomer) has the above official reliance. Antigen acid, lutein, sulfamic acid, ammonium, ammonium, amine, or a combination of these. These degree enhancers form a hydrogen bond because of the a group contained in the functional group. ㈣ ~ 3 has 4 _read ’, such as thief nitrogen, it can be engraved with a prostitutes, and the end of the fine-aged child has a warp group. Poly-negative acetoacetic acid 'has a recurring retarding group, in which there is a hydrogen atom and a negatively-charged night peptide L5 / thus forming a double dipole and the hydrogen atom has a local positive charge. Polyamines (eg, the second NR has the NR functional group that appears repeatedly, which also has a chlorine atom and a negatively charged nitrogen = two, which can also make the hydrogen atom have a local positive charge. The chlorine atom in these two cases opens ^ Air bond = recovery, or negatively charged atomic action on the fiber ', especially oxygen atom or nitrogen atom, in the middle of 1: negative i, super absorber or fiber combination. Density enhancer (post y = sub, It can also combine with oxygen atoms or nitrogen atoms in super absorbers or fibers that are bound by negatively charged atomic atoms.) The hydrogen atoms in the positively-charged gas forming a double dipole form a mutual side. Therefore, the density of polymerization increases. Two =, between ⑴ ⑴ and the density increase; (2) The density increase depends on the absorber (T has a super absorber that can generate hydrogen bonding functional groups). As a result, these fibers have a government bond that can form hydrogen bonds with the density increase, which makes the density increase and attached. For example, cellulose or man-made fibers may carry Functional groups such as Jingji, Jundiamine, Amine, Xingsi, etc. , Acid groups, amines, ΠΓ, and so on. In this way, the density of polymerization can be increased by the covalent bond 2 on the superabsorbent M ′, and the hydrogen density absorber can also be used to increase the density of the fiber. The fiber and quasi-surface have a high affinity, so the density is increased, and it partially covers the surface of the fiber, and it can be maintained during drying without being transferred to other surfaces. Miscellaneous The density enhancer is through hydrogen bonding, fiber material and super absorption ^ For example, 'polypropylene glycol can be used to combine water-insoluble polyacrylic acid hydrogel super absorbent' with cellulose fibers. B The glycol and ether groups on the diol density enhancer can form nitrogen bonds with the groups on the cellulose fiber and the ethyl hydrogel ± group, respectively. 17 c: \ Eunice 2004 \ ΡΚ-001-〇8 \ ΡΚ-ωΐ-0884 \ PK-001-0884-Tsuei.doc 200425917 =, for example, such as polypropylene glycol (PPG) density enhancer, can be used to combine water-soluble substances = 隹 素 ^ _. Glycol density It can be added to the chiral group and the ring, and can form hydrogen bonds with the warp groups on cellulose fibers and the appropriate functional groups on water-soluble substances. Therefore, the density-enhancing agent can be bonded with substances and fibers by hydrogen bonding. Polymerized dense = in the agent, every-repeated occurrence of units can appear to form hydrogen_guanguan, you can add two mothers and early position «polymer The number of tests that can be formed can also improve the bonding efficiency and reduce the chance of separation. The ether functional groups that repeatedly appear in ethylene glycol can provide ^ > Moon Dagger. The functional groups that repeatedly appear in polyvinyl acid are Acid groups, and the functional groups that repeatedly appear in amidines such as skin are cis and cis (where the ruler represents a chlorine atom, in particular = a low-carbon contact group such as less than five carbons, or formal or different Structure). The amine functional groups appear repeatedly in amines. The polymerized organic density-improving ship of the present invention can increase the A-bond efficiency as the length of the main chain increases. This is the case in Example #. The increased bonding efficiency should be attributable to the increase in the length of the atom, and the number of functional groups that can form hydrogen bonds or covalent bonds should be increased. Formerly, the polymerized density enhancers each have functional groups that can form hydrogen bonds or covalent bonds, and the parent species enhancer may have the above functional groups in the units that appear repeatedly. Therefore, the 'longer polymer' Wei provides more covalent bonds, which can produce hydrogen bonding or covalent bonding. 2. Although the present invention is not limited to a polymerization density enhancer of a certain molecular weight, the polymerization density improvement d preferably has a molecular weight greater than 500 g / mole, so not only has good physical properties, but also has a low specific ratio. The racy rush enhancer in 77 seeds is less volatile. A polymerized density enhancer with a molecular weight greater than 4,000 g / mole is better because such volatility is extremely low and it is not easy to volatilize from the superabsorbent. Low-molecular-weight rhenium materials are usually more cryptic than high-molecular-weight rhenium materials. Low-molecular rhenium materials are easier to move to the fiber / super-absorbent junction, and they are more absorbent by the fiber, which is not enough to bind the super-absorbent to the fiber. High molecular weight materials are less susceptible to fiber absorption and less volatile than low molecular weight materials. If this is the case, the higher the molecular weight of the polymerization density: the phase 4 degrees of the back can stay on the surface of the superabsorbent, which makes it easier to stick the superabsorbent to the fiber. Some practical towels can be used in the shape of 4 and 4 grams and polymer of molecular weight higher than _, but polymers with such molecular weight may be 1R C: \ Eunice 2004 \ ΡΚ -00Ί-08 \ ΡΚ-Ο0Ί-Ο884 \ PK-001-0884-Tsuei.doc 200425917 I am afraid that the performance of bonding will be degraded because it is not easy to handle. Some polymerized density enhancers have better bonding efficiency because of the relatively low efficiency of hydrogen bond formation of functional groups that occur repeatedly. We have found that the amidine functional groups that appear repeatedly are more effective than the carboxylic acid functional groups that are repeatedly bonded, and are more effective than the functional groups with hydroxyl groups. They are sequentially more effective than those with amine or other functional groups. Therefore, the polymerized density enhancer preferably has repeated amine or ether functional groups, more preferably repeated hydroxy groups, most preferably several carboxyl or carboxyl functional groups that appear repeatedly, and is most preferably an amidine functional group that appears repeatedly. Hydrogen bonding can occur at any pH, but is preferably at a neutral pH of 5-8, or preferably at a pH of 6-8, to reduce the degree of hydrolysis of the acids in the resulting fiber. Examples of suitable density enhancers include the following: polyethylene glycols (especially polyethylene glycol or polypropylene glycol), polycarboxylic acids such as polyacrylic acid, polyamines, polyamines, polylactone polyols Examples are polycaprolactone diols, and the above-mentioned combination of copolymers. 0 Polyweilic acids (such as acrylic acid), polyfluorenes or polyamines are particularly effective in hydrogen bonding. Among them, polyamines and peptides are the best. As noted above, the durable density enhancer may also include a non-polymeric density enhancer. Non-polymeric density enhancers are less volatile than water. In general, their vapor pressure is less than 10 = Hg, or less than 1 mm_Hg. Non-polymeric density enhancers contain at least one or more moon b clusters that form mouse or covalent bonds with the fiber. According to the present invention, the non-polymeric density increase 1 to 2 may include a functional group as listed below: carboxylic acid group, carboxylic acid salt, carbonyl group, acid, lutein, phosphate, dishic acid, silk, hetero, Amine group, or a combination of the above substances (such as amine group, or touch); its density-enhancement includes at least two functional groups, regardless of whether the two are the same. The non-polymerization density promotes property-conditions, he must have multiple B-bond groups that can form hydrogen bonds, or at least one functional group that can form hydrogen bonds, and at least one functional group that can form covalent bonds. The so-called "non-polymeric ( "n〇n_p〇lymeric)" refers to a monomer, dimer, trimer, tetrahydrate 'or oligomer, but there are some non-polymeric density enhancers that are monomeric or particularly preferred monomer. / Again " Some particularly suitable non-polymeric density enhancers ' can form a ring structure of six units with functional groups on the surface of the microparticles. This density increase _ example of amidine or amino acid (such as ° -grade amine 'or like glycine_amino acid) can be linked to form a six-unit ring 1Q C. \ Eunice 2 ° 0 ^ \ ΡΚ-00ΐ-08 \ ΡΚ-00ΐ-0884 \ ΡΚ-00Ί-0884-Τ5ΐιά.ά〇 € 200425917 is structured as follows:

Six units of cyclic structure can also be made of carboxylic acids, alcohols, and amino acids contained in amino acids, as follows: Xicheng

Density enhancer and micrograph: The functional groups on the grain surface can also form a ring structure of five units.

The particles refer to insoluble materials such as super absorbers, and the density enhancer is an alcohol, such as a polyhydric alcohol having a hydroxyl group on an adjacent carbon atom, such as 2,3-butane ^^. The density-enhancing agent with a cyclic structure of five units can also be used with water-soluble particles such as edta ^. At this time, the density-enhancing agent is an alcohol, such as a polyol with a hydroxyl group on adjacent carbon atoms. 〇 \ Eunice 2004 \ ΡΚ-ΟΟΊ-08 \ ΡΚ-ΟΟΊ-Ό884 \ PK-001-〇884-Tsuei.doc 200425917, such as 2,3-butanediol. Other faces that do not have a five-membered heterostructure are also the same. The higher alcohols have secret alcohols on the adjacent carbon atoms. Examples of suitable alcohols are: first-grade alcohol, second-grade alcohol enhancers are alcohols with a monoamine group (-NR2), including: 1 i 'diethylene glycol amine (2 · (2_aminoethyl (Oxy) ethanol). Non-polymeric poly _ includes more than one _ Guanguan, which also includes the following examples of ㈣density-enhancing acids: propylene succinate, maleic acid, butyl butyrate, cyclopentane, benzene tetra = Multi-reading refers to a lot of bases, including glycols such as glycols (dips emulsifying enzymes), ethylene glycol, propylene glycol, and triethylene glycol; three turns like glycerol 0,2,3 • C can also be used with sincerity bribery enhancer, with single-turn double-glycerin, such as oil and vinegar, and acid glycerol, especially suitable for use; multi-faceted or polyship compounds like tartaric acid or ascorbic acid (vitamin C ). " " Density enhancers for polybasic acid are acid containing calyx, including acetic acid (CH2OHCOOH) and lactic acid 'tartaric acid, ascorbic acid, spiculate acid, and salicylic acid. Amino acids such as glycine, alanine, transaminase, serine, glutamic acid, glutamic acid, lysine, or | 3 alanine are included in the density increase of the amino acids. Luteinic acid density enhancers and heterosalts are compounds containing guanosine (_so3H) or retinoic acid (-scv). Amino acid can also be used. One example of a density increasing agent of amino lutein acids is taurine, that is, 2-aminoethanesulfonic acid. Non-polymeric density enhancers are small molecules containing more than one amino functional group (e.g., monomers or dimers), such as diamine oxalate, urea, and bicondensation. Similarly, non-polymeric density enhancers can also be non-polymeric molecules containing more than one amine functional group, such as amino acids such as ethylene diamine, EDTA or asparagine, and glutamine. Although there are still many non-polymeric organic density enhancers that meet the above explanations, the preferred examples of non-polymeric organic density enhancers are a large class of compounds containing glycerol. , Urea, glycine, isopentaerythritol, monosaccharides, disaccharides, citric acid, taurine, tartaric acid, dipropylene glycol, urea derivatives, phosphate esters, phosphoric acid, and combinations of the above substances (such as hydroxy acids). 21 C: \ Eunice 2004 \ ΡΚ-00Ί-08 \ ΡΚ-00Ί-0884 \ PK-001-0884-Tsuei.doc 200425917

Preferred examples of non-polymeric density enhancers are also compounds containing glycerol: glycerol, diglycerides, glycerol oligomers, propylene glycol oligomers, urea, and combinations thereof (such as glycerin and urea). The "oligomer" as used herein refers to a product condensed from a polyhydric alcohol, and the condensation product contains less than ten monomers. The glycerol oligomer herein refers to a product obtained by condensing two to three molecules. The propylene glycol oligomer as used herein refers to a product obtained by condensing two or more propylene glycol molecules. Non-polymeric density enhancers may also contain the following functional groups: acid groups, carboxylic acid esters, carbonyl groups, sulfonic acids, sulfonates, phosphates, phosphoric acid, hydroxyls, amines, amidines, and a combination of the above ( Such as amino acids and hydroxy acids). Non-polymeric density enhancers contain at least two or more of the functional groups listed. These two functional groups may be the same or different. S Each of the above-listed polymerization density enhancement programs has the ability to make hydrogen bonds because they all have negatively charged atomic functional groups, especially oxygen atoms, money atoms, and ammonium containing oxygen or nitrogen atoms or even hydrogen atoms. A negatively charged functional group. In other words, amino alcohols and sincerity both have-home, one of which is a hydrogen atom combined with a negatively charged oxygen atom to form -dipole 'and the hydrogen atom has a local positive charge. Glycolic acid, amino acid, in the material-a hydrogen atom is combined with a negatively charged nitrogen atom to form a -dual pair = and the lice atom also has a local positive charge. The above two kinds of atomic interactions with local positive electricity can also have negative charges, such as microparticles or fiber surface two enhancers on microparticles or fibers. Poly-ship, via acid, === isothermal / two, weaving with negatively charged oxygen atoms, can be combined with hydrogen atoms on the surface of particles or fibers, or close to ι and silk or _ 之 _ towel boundary y 1 = fiber A negatively charged atom (such as an oxygen source with a partial positive charge to stabilize the sedges i increased! 3mm 所 species said, two "degree increase _ (glycine_ is one of the glycine hydroxyl radical (- 0H), between the wind atoms. Another hydrogen bond is between the interatoms. == The chlorine on the bond to the radical 丨 F is represented by the M dot line, which is between the hydroxyl group of the density enhancer c: \ Eunice 2004 \ PK -W7-081ΡΚ-ΟΟΊ-0884 \ PK-001 ^) 884- Tsuei.doc 22 200425917 (~ OH) and the hydrogen atom of the radical (-OH) on cellulose. Another hydrogen bond is Between the oxygen atom of sickle (__〇H) of the diol density enhancer and the hydrogen atom on the hydroxyl group of the alcohol group side of the cellulose main bond. Water may also be inserted between the fiber and the density enhancer. Or other molecules that can form hydrogen bonds, so that the fiber and the density enhancer are combined with hydrogen molecules by water bonds. ^ In some embodiments, the density enhancer is combined with fibers and particles with hydrogen bonds. Polyols Type = degree enhancer's such as glycols, which can be combined with polyacrylic acid hydrogel particles and cellulose knives. The basic compounds on the degree enhancers of sulfonyl alcohols and cellulose fibers The base and the hydroxyl groups on the polyacrylate hydrogel form hydrogen bonds respectively. Therefore, the density enhancer can use hydrogen bonds and particles to bind to the fibers. The hydrogen bonding provides excellent bonding performance and reduces the bonding to the fibers. The particles on the surface are separated. Density enhancers with a particularly significant hydrogen bond formation efficiency include compounds having a carbonyl group, such as ochermic acid, or compounds containing amine groups such as urea. Compounds containing a base group are also Relatively effective density enhancers. Amine and ether functional groups are less effective density enhancers. All the functional groups of bifurcation enhancers can be selected individually or in combination from the following: carboxyl groups, carboxylic acid esters, Carbonyl, hydroxyl, sulfanilic acid, sulfanilate, phosphoric acid, phosphate ester, ammonium, amine, or a combination of the above. These functional groups can be exemplified by the following chemical substances: carboxyl groups are provided by dicarboxylic acid k, Tartaric acid, tantalate, which is an ionized end acid, can be obtained from materials such as potassium citrate; carbonyl groups can be provided from aldehydes or ketones; hydroxyl groups can be provided from alcohols or multiple types, such as ethylene glycol, or Glycerol esters and diglycerides, that is, esters made of glycerol; amines, such as urea; amines, can be obtained from aminoalkanes, such as ethanolamine, where the density enhancer contains at least two functional groups, each functional group May be the same (for example, polyalcohol, polyaldehyde, polyene acid, polyamine, or polyamidoamine) or different (for example, amino alcohol, hydroxy acid, ammonium amine, chloramine, or amido acid). Functional groups It may also be selected individually or in combination from the following: carboxyl, alcohols, amidines, and amines. Aldehydes are also added to the above groups, especially it can be oxidized carboxylic acids. The second absorbing layer (26) can be prepared by sending a uniformly mixed high-unit super-absorbent body and fluff pulp into a copying tank (eg, US Patent Application No. 1 ^ 2002 listed by Sawyer et al.) / 0156441 described in the A1 document, the relevant parts listed here are for reference only), the traditional c: 'E ~ 4 \ p_ 卿 ⑽] 〇qing⑽ and f 200425917 production line of absorptive drum copying method. Dispersion of the superabsorbent can be minimized by using a woven polyester web, which has a pore size of 300 microns, and wraps the entire copy drum to cover the copy web. Alternatively, an extremely fine mesh screen having a pore diameter of 300 μm or less may be used. The openings in the fiber = or web should be small enough to retain most of the superabsorbent body, while at the same time having large enough gaps to maintain sufficient air permeability so that the absorbent layer can be copied into shape. By using an inline drum machine instead of an offline paper machine, a larger amount of absorbent material can be placed at the most suitable location. For example, the second absorbing layer (26) can be formed into a special shape, such as a drip shape, or a deep groove can be made on the dip net to obtain a larger amount of absorbing material at a specific location. The second absorbent layer (26), once formed, leaves the papermaking machine in a very low consistency state and is further densified. As shown in the fourth figure, the super absorbent body and the fluff pulp can be uniformly mixed in the papermaking tank (128) of the drum papermaking machine (126). Man-made fibers or carrier particles can also be mixed with superabsorbents and fluff pulp. In order to reduce the loss of the super absorbent, a porous web with a pore size of about 300 microns, such as a woven polyester web, will be used. The entire drum (132) of a drum-type papermaking machine (126) will be used. ) So as to cover the net (m) of the drum (132). Alternatively, a fine-grained, or microporous, dip net can be used instead of the traditional dip net (134). Or, just before the mixed liquid containing the superabsorbent is in contact with the copying net (134) in the copying tank (128), the layer-high content fluff pulp mixed liquid flows to the copying net (134). Regardless of the effective pore diameter of the surface of the screen, it is less than 300 microns. The air permeability of the screen surface must be high enough to make a homogeneous absorbent layer, and the surface must be durable enough. Taken together, these two characteristics indicate that the threat needs to be between 75 and 3 μm. The dip net (134) can be a flat type or a microporous type, can be a flat __ or an absorbent screen with a special shape in part. For a detailed description of this procedure, please refer to the description of US Patent Application No. US2002 / 〇156441 A1 listed by Sawyer et al. The relevant parts listed here are for reference only. If an on-line drum papermaking machine (126) is used instead of a second-line papermaking machine to manufacture the second absorbent layer (26), a larger amount of a uniform mixture of superabsorbent raw materials and fluff pulp can be directed to the second At least one most suitable site on the absorbent layer (26) to make full use of the incremental absorbent material. In addition, according to the needs of manufacturers and consumers, by adjusting the amount of super absorbent body and fluff pulp, it is possible to easily change and collect ~ (16) the total absorption of the absorbent product (10). Therefore, as long as the above-mentioned drum-type papermaking machine ⑽) is used and the amount of fluff and super absorbent is adjusted, the absorption amount can be easily obtained from% 24 C: \ Eunice 2004 \ ΡΚ-00Ί-08 \ PK-001-0884 \ PK-OQ1-Q884-Tsuei.doc 200425917 to over 1200 grams. A nozzle (136) is arranged directly above the copying groove (128) to disperse the super absorbent body and ensure that the super absorbent body can mix with the fluff pulp uniformly. Examples can be found in US Patent Nos. 6,207,099 and 6,267,575, and the relevant parts listed are for reference only. Alternatively, the nozzles (136) are arranged in such a manner that a distribution gradient is generated in the second absorption layer (26). When the second absorption layer (26) leaves the copying groove (128), the density is very small, about 0.1 g / cm3 or less, and its density must be increased. The second absorbing layer (26) may be placed on a conveying device or a conveying cloth (135). Next, the second absorbent layer (26) is compacted to a density of at least 0.25 g / cm3 or preferably 0.30 g / cm3. The densification procedure can be performed using a conventional press roller (137) or, more suitably, using a heated clamp (138) as shown in the fourth figure. The heated clamp (138) is suitably heated from about 80 ° to about 150 ° C. A suitable basis weight of the second absorption layer (26) is about 80 to 1000 gsm, preferably 100 to 800 gsm, more preferably 120 to 750 gsm. After the second absorbent layer (26) is compacted, the thickness of the second absorbent layer may be such that the total thickness of the absorbent product (10) does not exceed 10 mm. In other words, the thickness of the second absorbing layer is only required to maintain the total thickness t2 of the absorbent core (16) between 10 mm and 8 mm. Therefore, in general, the thickness of the second absorbing layer (26) is between 0.02 and 5 mm, preferably between 0.5 and 3 mm, and more preferably between 0.6 and about 2 mm. In the copying process, the mixed liquid of the super absorbent body and fluff pulp can be wetted to facilitate the compaction of the manufactured second absorbent layer (26) and reduce the pressure or stiffness of the drum. For the method of heating or wetting in the process of manufacturing the absorbent layer composite material, refer to U.S. Patent No. 6,214,274, and the relevant parts are listed for reference only. Alternatively, a pattern may be embossed onto the second absorbent layer (26) to reduce its stiffness. Looking back at the first figure, the first absorbing layer (24) and the second absorbing layer (26) may have any suitable length. As the tongue says, 'the length of the second absorbent layer (26) may be less than, equal to, or greater than the length of the first absorbent layer (24). Similarly, the first absorbing layer (24) and the second absorbing layer (26) may have any appropriate width. For example, as shown in the second and seventh figures, the width of the first absorption layer (24) is larger than the width of the second absorption layer (26). In the sixth figure, the widths of the first absorption layer (24) and the second absorption layer (26) are approximately equal. In the eighth figure, 'the width of the first absorption layer (24) is smaller than the width of the second absorption layer (26). Referring to the second figure, the thickness t1 of the absorbent product (10) is less than millimeters. To be clear, the thickness t of absorbing 25 C: \ Eunice 2004 \ PK-001-08 \ PK-001-0884 \ PK-OQi-〇884-Tsuei.doc 200425917 sex product (10) is preferably between about Find 7 millimeters to 8 millimeters. More specifically, the thickness t! Of the absorbent product (10) is preferably about 5 mm. The thickness of the thickness, or the thickness of the absorbent product (10), can be measured with a thickness gauge, such as Digimatic indicator Gauge model DF 1050E, marketed by Mitutoyo Corporation of Japan. A typical thickness gauge is connected with a smooth pressure plate. meter. The size of the pressing plate is smaller than the length and width of the second absorbing layer (26). The thickness of the absorbent product 通常 is usually 疋 at a pressure of 1.4 kPa at a room temperature (23.c) of 50% relative humidity. The density of an absorbent material is expressed in grams per cubic centimeter. Its basis weight (grams per square meter) can be divided by the product of its thickness (centimeter) and 10,000. ', Density (g / cc) = basis weight (gsm) / (thickness (cm) * 10000) Reviewing the second figure again, the thickness t2 of the absorbent core (16) is less than 5 mm. To be clear, the thickness t2 of the absorbent core (16) is preferably between about 2 mm and 4 mm. More specifically, the thickness ti of the absorbent core 疋 is preferably less than 3 mm. The thickness t2 of the absorbent core (16) can be measured in a similar manner to the thickness ti of the absorbent product (10), but the absorbent core must first be removed from the absorbent product. It can also be seen that the absorbent product (10) has an adhesive strip (40) adhered to the outer surface of the separator (μ). The adhesive strip (40) may be a hot-melt adhesive or a cold-melt adhesive, and its function is to put the absorbent product (10) on the inner side of the crotch portion of the underwear during use. The adhesive strip (40) allows the absorbent product (10) to be aimed at the user's urethra and held in place in order to achieve complete protection against inadvertent urination. The rubber strip (40) may be one or more narrow lines coated on the separator (14), or it may be coated in a swirl pattern. The combined composition of the rubber strip (40) allows the user to tear off the absorbent product (10) and readjust the position on the underwear as needed. An example of a suitable adhesive strip (40) is the product classification number 34_56〇2, produced by National starch and Lu Chemical Company. The address of this company's office is 10Findeme Avenue, Bridgewater, N.J. In order to protect the adhesive strip (40) from contamination before use, a peelable, instant tear film (42) is used. That is, the tear film (42) can be made of paper or processed paper. The standard instant tear film (42) is a white leather peelpaper glued on one side, which can be easily peeled off by the rubber strip (40). The user only removes the instant tear film (42) before attaching the absorbent product (10) to the inside of the crotch of his or her panties. The three suppliers of tear film (42) include Tekkote, International Paper

Release Products, Namkyung Chemical Ind_ Co., Ltd. Tekkote's address is 580 Willow Tree Road, Leonia NJ 07605 〇 26 c of International Paper Release Products: \ Eunice 2W4 \ PK-001-08 \ PK-00i-O884 \ PK-O01-〇884-Tsua.dt 200425917 It is 206 Garfield Avenue, Menasha, W1S 94952. Nan ^ yung Chem1Cal ancestor

The address of Ca, Ltd. is 202-68 Songri, Taean-eup, Hwase_g4um, Kyunggi, Korea. Absorptive products that do not need to be attached to the manufacturer's undergarments, such as natural diapers, and adult diapers (tights, bottoms, preventive undergarments) do not require adhesive tape. Referring to the fifth figure, there is shown a schematic diagram of the manufacturing procedure of the absorbent core (16) of the present invention. This process includes the introduction of raw materials into the first-absorptive layer (24), which may be made from a finished roll (202). The raw material of the second absorbing layer (26) is as described in the fourth figure of the preceding paragraph. The raw material for making the first absorbing layer (24) is sent to a cutting machine (204) to cut into individual pieces or sections (24a), (24b), (24c), and placed in the making of the second absorbing layer (26). ) The raw material is conveyed by the first conveying f (206) under the cutting machine (204). Then, the raw material for forming the second absorption layer (26) is cut by a cutting machine (208) at a set speed, so that the first absorption layer (24) and the second absorption layer (26) leave the set speed. When the machine (208) is cut, an absorbent core (16) is formed together. The first absorbent layer (24) and the second absorbent layer (26) of each unit are separated from each other by a second conveyor belt (2o), which travels faster than the first conveyor belt. Next, the absorbent core (16) including the first absorbent layer (24) and the second absorbent layer (26) may be fed into one or more post-processing units (11) according to the final structure of the absorbent product (10). 212). According to Nie Ru, the absorbent core (16) can be fed into the back part with a separator and a body-side lining. We have found that the procedure of the present invention can produce an absorbent layer that meets the required thickness without detracting from the effectiveness of the superabsorbent body. Preferred Embodiments The following exemplary examples provide a more detailed description of the present invention, and should not be considered as a limitation of the present invention in any way. Liquid saturation retention The following test is to measure the ability of the absorbent core (16) and the absorbent product (10) to retain the liquid. The method for measuring the liquid saturation retention is described below. The material to be measured with a moisture content of less than 7% of the total weight is first weighed and immersed in a saline solution with a concentration of more than 0.9% by weight at room temperature (23 ° C). Let the material under test be immersed in water for 20 minutes. After being immersed for 20 minutes, the material was taken out and placed on a 25-inch (0.6 cm) fiberglass screen (104) coated with TEFLON mesh fishing as shown in the ninth figure (can be set up in Petersburg, N · Υ · Taconic Plastics Inc., the company negotiates purchase), 27 c. \ Eunice 2004 \ ΡΚ-001 -〇8 \ ρΚ-〇〇Ί-〇884 \ ΡΚ-ΟΟΊ-0884-Tsuei.doc 200425917 The vacuum box (100) is covered with an elastic rubber shielding material (102). The vacuum M applies a G.5 vacuum negative pressure (Qi 3.5kPa) per square pair for 5 minutes, such as a vacuum gauge (106) and a vacuum pump (108). Then remove the object to be weighed. The moisture content of the material to be tested can be obtained by subtracting the dry weight from the wet weight (treated in a vacuum box), and recorded as the absolute liquid saturation retention, expressed as the weight of the liquid retained. If there is =, the weight of the retained liquid is converted into the volume of the liquid based on the density of the liquid used for the test. This $ ^ is the liquid saturation retention amount, expressed as the number of milliliters of liquid retained. The lower the value obtained] ^ the less liquid the product can hold under pressure. -For comparison with each other, the absolute liquid saturation retention can be divided by the weight of the tested material to obtain an actual liquid saturation retention, expressed in terms of the weight of liquid that can be retained per gram of the tested material. If the object is attracted through the glass fiber mesh on the vacuum box, such as Qian Shengfu material or fiber, a finer mesh must be used. Alternatively, _ tea bags or similar materials can be placed between the test and _, and the final silk must be used to modify the water content of tea leaves or similar materials. Cylindrical compression 詈 Cylindrical compression test is to measure the external force (extreme value), 50% load elongation, and peak energy of a 50 × 300 mm cylindrical material. These Both are related to the stiffness of the test object. The extreme value of the load can be expressed in terms of the absolute grammage of the force. &Quot; ^ Divide the extreme value of the load by the base weight of the material (the unit is the weight per square meter, Qing), and get ^ one grams / gsm expression . Compressing a cylindrical absorbent material can obtain its extreme load along the edge. The higher the value, the larger the sample. If the stiffness value is slightly higher, when the fairy wears ^, it will not be considered to be "hard" ^. Generally, a lower stiffness value is better than a higher stiffness value, but the most appropriate stiffness depends on the comparison. #For example, if it is a baby diaper, the stiffness value should be less than 6grams / gsm. If the stiffness value is too high, the absorbent material may cause discomfort to the user and be considered uncomfortable by the wearer. Take a 50 mm x 300 mm (2 忖 by 12 忖) square sample, roll it into a cylindrical shape along the side, and secure the ends with staples. Take a load cell, such as a product made by MTSSyStemsCorp, located in Park, NC, with a compression plate and a load value between 0 and about 5000 grams. _The starting width (standard distance) of the board is approximately% mm. Place the sample to be tested 28 C: \ Eunice 2004 \ ΡΚ-ΟΟΊ-Ίβ \ ΡΚ-00Ί-0884 \ PK-Wl-0884-Tsuei.doc 200425917 and lower the upper compression plate onto the sample , At a rate of 25mm / min until the standard distance reaches 30.5mm, measure the external force and record it. The maximum external force (peak load) is expressed in grams. The 50% load extension of the sample can also be measured and recorded. For comparison, you can divide the extreme load or the 50% load extension of the sample by the basis weight of the absorbent material sample to get the corresponding load per unit basis weight. A detailed description of the measurement method can be found in US Patent No. 6323388, and the relevant parts listed are for reference only. Example 1 A variety of absorbing layers were prepared as shown in Table 1. Samples 1A-1C contain 50% of kraft pulp fibers, which contains 16% of hardwood pulp fibers, produced by WaterFibers, Childersbui * g, AL, and 50% super absorbent, such as by D〇 w, Midland, MI Dow DRYTECH2035. Samples 2A-2C contain 50% of pulp fibers treated with a durable density enhancer, ND-416 from Weyerhauser Co .; and 50% of superabsorbents, such as those from Dow, Midland, MI DowDRYTECH2035. The basis weight of each sample was 472 gsm. The sample is produced by uniformly mixing the same amount of fibers and superabsorbent into a copying tank. For each formulation, a pad with a basis weight of 472 gsm fibers and a super absorbent was obtained on the web. The gasket composed of the obtained fiber and the super absorbent body is further passed through a compression clamp composed of two steel rollers placed opposite each other. The spacing of the steel drums can be adjusted to produce the required thickness and density. The combination of ND-416 pulp and density enhancer has a wider pitch than that required for CR-1654 raw materials, which indicates that ND-416 material requires less external force to compress the density. For each combination of pulp and super absorbent, the distance between the press rollers required to achieve a certain density is shown in Table 1. Table 1 shows the distance between the compression rollers, the liquid retention amount, and the cylindrical compression amount of the above samples measured by the method described above. Sample copy / density (g / cm3) Press roller spacing (mm) Liquid retention (g / g) Cylindrical compression (g) (g / ssm) 1A, 0.15 0.47 18.4 438 0.93 1B, 0 · 26 0.25 17.8 917 1 · 94 1C, 0.35 0.01 17.4 1483 3.14 2Α, 0 · 15 0.56 19.2 309 0.66 2B, 0 · 26 0.41 18.8 590 1.25 2C, 0.35 0.26 18.8 1061 2.24 Section grams 29 C: \ Eumce 2〇4 \ PK -m ^ 8 \ PK-001-0884 \ PK-OOi-0884-Tsuei.doc 200425917 It can be found that compared with the 1A-1C sample, the 2A-2C sample can still have a larger liquid at a higher density. Retention. In addition, compared with the 1A-1C sample, the 2A_2C sample has a lower cylindrical compression stiffness. Needless to say, the sample 2A_2C containing ND-416 pulp requires a larger distance between the compression rollers and a smaller applied pressure, which means that if the pulp treated with a non-fading / density enhancer is used, it is easier to produce thin Absorption products. Therefore, we can expect that, compared with an absorbent layer that does not contain a density enhancer-treated paper fiber, an absorbent layer made of fibers that are not easily dissipated with a density enhancer-treated fiber will increase the liquid retention and feel the softness. increase. '' Example 2 A typical thin sanitary napkin is made of an absorbent core. The method is described in detail later. The thin sanitary napkin also includes a polypropylene film base layer and a 22 gsm Sawabond 4346 bonded carded mesh lining, produced by Sandler VliesstofiWerk GmbH & Co. KG, Schwarzenbch An Der Saale, Germany. . There is also a 40 gsm bonded carded web layer between the liner and the absorbent core, produced by Shalag Shamir NonwovenFabric Industry located in Upper Galilee, Israel. For detailed specifications of each sample, see Table 2. The absorbent core includes a first absorbent layer disposed vertically above the second absorbent layer. The upper absorbing layer is made of 31% by weight FAVOR SXM-880 super absorbent, 9% Trevira 2 denier 3 mmType255 binary composite fiber, and 60% Weyerhaueser NB-416 kraft paper fiber with a dry strength of about 23 to 26 Newtons / 50 mm. The second absorbent layer contains fibers treated with density enhancers such as Weyerhaueser NB-416 as seen in the market, and a super absorbent body like DowDRYTECH2035M produced by Dow. For detailed specifications of each sample, see Table 2. The liquid retention and thickness of these ultra-thin sanitary napkins were measured. The results are shown in Table 2. Table 2 Standard Sanitary Cotton Standard Sample Upper / Lower SA (%) Fiber (%) Density (g / cc) Thickness (mm) Retention (g) A 200 gsm Bonded Airlaid 31 69 0.193 1.04 N / A Control Group 2x 200 gsm bonded airlaid 31 69 0.193 2.08 N / A Total: N / AN / AN / A 3.12 54 C: \ Eunice 2004 \ PK-001-08 \ PK-001-0884 \ PK-001-0884- Tsnd.doc 30 200425917 Β 180 gsm bonded airlaid 31 69 0.2 0.9 N / A 300 gsm fluff pulp (NEM16) / SA 50 50 0.35 0.86 N / A Total: N / AN / AN / A 1.76 52 C 180 gsm Bonded airlaid 31 69 0.2 0.9 N / A • 300 gsm fluff pulp (NEM16) / SA 50 50 0.18 1.7 N / A Total: N / AN / AN / A 2.6 54 D 180 gsm bonded airlaid 31 69 0.2 0.9 N / A 300 gsm fluff pulp (NEM16) / SA 50 50 0.18 1.7 N / A Total: N / AN / AN / A 2.6 52 Ε 180 gsm bonded airlaid 31 69 0.2 0.9 N / A 300 gsm fluff pulp (NI > 416) / SA 35 65 0.18 1.7 N / A Total: N / AN / AN / A 2.6 47 SA = Super Absorber We can find that samples with higher content of Super Absorber have higher Liquid retention. As described above, the amount of absorption of the absorbent core can be adjusted by controlling the basis weight of the second absorbent layer or the content of the super absorbent body. We can also see that the second absorbent layer in samples B and C contains fibers treated with a density enhancer, which is not only thinner but also about the same amount as sample A. Example 3 A typical absorbent pad for an adult is composed of an absorbent core, and the absorbent core includes a first absorbent layer vertically disposed above the second absorbent layer. The first absorbent layer is produced by Concert Industries of Thurso Quebec Canada and contains 30% by weight of Stockhausen FAVOR SXM-880 super absorbent body, 5% KoSa 2 denier 6 mm type 255 binary composite fiber, 65% WeyerhaueserNB -416 pulp, and its tensile strength is about 45 Newtons / 40 mm. The second absorbent layer contains, for example, Dow DRYTECH 2035M super absorbent manufactured by Dow, and a fiber treated with a density enhancer such as Weyerhaueser NB-416. See Table 3 for detailed specifications of each sample. The absorbent pad also contains a polypropylene base layer as a water vapor barrier. On the body side is a wettable 17 gsm ribbed spunbond lining material. Between the liner and the absorbent layer is a wettable 50 gsm meltblown superabsorbent material. Both materials are available from Kimberly-Clark Corporation, Dallas, TX. 31 C: \ Eunice 2004 \ ΡΚ-ΌΟ1-〇8 \ ΡΚ-ϋΟΊ-〇884 \ PK-001-0884-Tsuei.doc 200425917 Table 3 Standard sample of superabsorbent sanitary pads Upper / lower SA (%) Fiber (%) ) Density (g / cc) Thickness (mm) Retention (g) F 910gsm fluff pulp / SA 43.5 56.5 0.13 7.0 Control group 425 gsm fluff pulp / SA 11.8 88.2 0.18 2.36 N / A Total: N / AN / AN / A 936 ~ ^ 56 G 400 gsm bonded airlaid 30 70 0.15 2.67 N / A 472gsm fluff pulp (ND »416) / SA 50 50 0.35 1.35 n / a Total: N / AN / AN / A 4.02 239 Η 400 gsm bonded airlaid 30 70 0.15 2.67 Πνγ / Α 472gsm fluff pulp (ND > 416) / SA 50 50 0,18 2.62 n / a Total: N / AN / AN / A 5.29 243 I 400 gsm bonded airlaid 30 70 0.15 2.67 n / a 472gsm fluff pulp (NEM16) / SA 30 70 0.18 2.60 n / a Total: N / AN / AN / A 5.29 221 J 400 gsm bonded airlaid 30 70 0.15 2.67 N / A 472 gsm Fluff pulp (ND416) / SA 30 70 0.35 135 Total: N / AN / AN / A 4.02 221 SA == Super absorber We can see that the density of the lower layer (the second absorbent layer in this example) is higher than Large samples and low density samples Comparing (say, compare samples G and H), has not sacrifice the amount of liquid absorbed. ¥ Of course, their thickness is already considered thin. In addition, reducing the amount of superabsorbent will reduce the liquid retention (for example, comparing samples Η *.) This shows that we can control the absorption of the final product by adjusting the composition of the second absorption layer. According to the present invention, different absorption layers are made and the tensile strength is measured. The tensile strength can be measured by using Microcon π produced by the company Instronco IP, which is located in Canton, ΜΑ. This instrument first uses a 100 The weight is reset in the center of the upper clamp, and the pendant is hung up to correct the reading. The stretch sheet used is -5 kg weight, and the motion correction self-induction device is used. The data will be in the M brain It is shown on the con instrument. This program is performed in a room set in a fresh environment, that is, the temperature is about 23 ° C and the relative humidity is 5000/0. Too much material is used to take a rectangular sample of 5 cm by 12 cm . Multiply this dry sample by ^ minutes) by 3 inches (7.62 cm), rubber-coated pneumatic clamp 32 C \ Euntce 2004 \ PK-〇〇l ^) 8 \ PK-001-0884 \ PK-Wi- 0884-Tsuei.doc 200425917 Placed properly. The standard distance is 10 cm, and the rate of + refers to the sample "Before feeding-". Cross head Loss of movement speed. The so-called "tensile strength" is Yatsuchi Y. Twenty-two / Shih is the force required to permanently stretch or break the sample (Single-water two-wire T2: Same-day building? Drying and tensile strength measurement when 1GG% saturation. Suction, ... Guangyou ^ 1 sheet The strength is fine-the dry sample is placed in a saline solution with a concentration of more than 0.9%, and the sample is taken out and placed on the fixture. The method is described in Table VII. The measurement results are shown in Table IX. / T ~ —% ~ 31 ~ ~ 50 ~ Fiber density g / cc Thickness jtnm Dry strength gram Wet strength gram 1 200gsm Adhesive airlaid — 272 gsm M4> L (CR-1654) / SAP 69 ~ 50 ~ 0.19 ^ ολΓ 1.04 3.14 3127 817 99 〇3 272 gsm fluff pulp (CR-1654) / SAP * 50 50 0.35 1.35 yy 202 〇4 `` 272 gsm fluff pulp (ND-416) / SAP 50 50 0.15 ^ .14 86 〇5 272 gsm & wool pulp (ND-416) / SAP— 50 50 1.35 1.35 OW 585 〇6 100 gsm bonded airlaid 0% 100% 0.067 _L5 2795 1389 SA = super absorbent body Note 1: Π% viscose fiber (KoSa 100 gsm bonded airlaid raw material is 83% pulp and 2 denier 6mm type T255 composite adhesive fiber). Note 2: 200 gsm | The material is 31 ％ / 〇weight fraction ❺St〇ckha sxm_88〇 super absorbent, 9 / 〇 viscose fiber (KoSa 2 denier 6mm type T255 composite viscose fiber), 60% kraft pulp. ° • ND · 416 is Density enhancer provided by Weyerhaueser Co. • CR_1654 is a kraft pulp containing 16% hardwood, supplied by us Amance, Childersburg, Alabama. • All underlying SAs are Dow DRYTECH 2035. As shown in Table 4 'Adhesive Airlaid The material retains a very high tensile strength even when wet (compare code 6 and codes 2 and 5). In fact, the unbonded material (code 2_5) does not have tensile strength at all in the wet state. In addition, and the density Compared with lower unbonded materials, higher density unbonded materials have higher dry strength (compare codes 3, 5 and codes 2, 4). Example 5 Take a variety of liquids with a retention of about 100 grams of fines. A prototype of a thin pad, and a small-scale blind test study with a customer of POISE® Thin pad 33 c: \ Euntce 2004 \ PK-W7 ^ 8 \ PK-O0i-O884 \ PK-OOi-O884-Tsuei.doc 200425917. p〇ISE (g) Xhinpad is used as a control. Twenty-four individuals suffering from incontinence were selected as testers in this study. The study design was divided into six groups. The mother group had four testers. Thirteen participants participated in comparing the prototypes R, L, and N with the control C. The other 11 did a comparison of product prototypes. The testers personally used each product prototype for four days ’followed by a focus group interview (f〇CUSgr〇Up). In other words, the arrangement of each group is as follows: the first group, C to R; the second group, c to L; the third group, (: pair) ^; the fourth group, R to L; the fifth group, L to N; The sixth group of R to n. The definition of the code is as follows: The code describes the first absorption layer of C POISE® Thin R 200gsm, which contains 31% superabsorbent (StockhausenFAVOR SXM-880) '9% binary composite Fiber, 60% kraft pulp fiber made rectangular, tensile strength, 25 to 27 Newtons / 50 mm, placed vertically on another second absorbent layer, its basis weight is 290 gsm, containing 50% ND- 416 and 50% superabsorbent (DRYTECH2053M) 'are made into a racetrack shape. The first absorption layer of L200gsm contains 31% superabsorbent (StochausenFAVOR SXM-880) , 9% binary composite fiber, 60% kraft pulp fiber made of rectangular, tensile strength of about 25 to 27 Newtons / 50 mm, placed vertically on another second absorbent layer, its basis weight is 385 gsm, Contains 50% of ND-416 and 50% of super absorber (DRYTECH2035M), made into a racetrack shape. The first absorbent layer of N 100 gsm contains π% of binary compound Dimension, 3% latex adhesive, 80% kraft pulp fiber made of racetrack shape, tensile strength is about 26 Newtons / 50 mm, placed vertically on another second absorbent layer, and its basis weight is 545 gsm, Contains 50% of ND-416 and 50% of super absorbent (DRYTECH2035M), made into a rectangle. In mother breeds. In interviews after the trial period, various product prototypes are placed on the table Let the testers review. Each tester evaluates their recent trial experience as a whole, and selects the prototype product that they think is most likely to be used. They also test the feeling separately (testers are not allowed to touch any pad products), Choose the best absorption effect, the most comfortable, and the most stable when worn. At the same time, select two prototypes that will never consider wearing again. The detailed description of the structure of the absorption layer and the liquid retention of the parent code can be found in Table 5.

34 C: \ EMmce2004 \ PK-W1-〇e \ PK ^ 〇7-〇884 \ PK-〇〇 ^ 884.Tsuej.d () C 200425917 Table 5 Code Upper / Lower SA (%) Fiber (%) Density (g / cc) Thickness (mm) Leave ¥? ~ (g) C 448 gsm fluff pulp / SA 43.5 56.5 0.12 3.73 N / A — Control group 306 gsm fluff pulp / SA 10.0 90.0 0.16 1.91 waT ~ Total: 5.64 97 The upper layer is rectangular R 200 gsm bonded airlaid 31 69 0.193 1.04 N / A — 290gsm fluff pulp (NEM16) / SAP 50 50 0.30 0.97 N / A ~~ Total: 2.01 107 ^ The upper layer is rectangular L 200 gsm bonded airlaid Net 31 69 0.193 1.04 N / A — 385 gsm fluff pulp (ND-416ySAP 50 50 030 1.28 N / A Total: 2.32 93 _ The lower layer is rectangular N 100 gsm bonded airlaid 0 100 0.082 1.2 N / A — 545gsm fluff Pulp (ND «416ySAP 50 50 0.3 1.81 N / A ~~ Total: 3.02 The lower layer of the 8 plant is rectangular Note 1: The 200 gsm bonded airlaid material in Table 5: • Stockhausen SXM- 880 Super Absorber. • 9% Binary Viscose Fiber (Trevira Type T255 3mm 2 denier Viscose Fiber) • Approx. Tensile Strength 25 to 27 Newtons / 50 mm • 100 gsm bonded airlaid material from Form 5 manufactured by Concert Industries: • 17% binary adhesive fiber • 3% latex adhesive • 80% kraft pulp Note 3: Note 4 : Tensile strength is about 26 Newtons / 50mm weyerhaueser ND.416 The SAP of the lower layer with ND-416 pulp is Dow 2035M. The control group of code c is made of traditional low-density knitting wool SAp absorbing material. The product is thick. In addition, for every code other than N, the amount of liquid absorption is about Γΐί The upper rectangular absorption layer made of bonded airlaid material is relatively small. Replacing Lai A, rectangular _ under the branch There is no significant difference in the phenomenon of being placed next to each other. This is exactly 10 of the ultra-fine people.) They like to use the code R. As far as the measurement data is concerned, the effect of the thin-thickness pads of each code product is sought. Most people (13 C: \ Eunice 2004 \ ΡΚ-00Ί-08 \ ΡΚ-00Ί-0884 \ ΡΚ-ΟΟΊ-0884-Tsuei.doc 35 200425917 L and N are even worse than the control group. Thin, secret, It is popular that it will not bulge or deform when used. The product of code N does not contain a super absorbent in the upper towel. Compared with the control group and other products, it seems to "cover" the used product. The color of the urine. The lower layer of the code Han's product is larger and easier to bulge than the codes N and L, but it is still not as good as the control group. This seems to indicate that the upper layer of the larger piece is equipped with a smaller area of adhesive layer (code N * L) has its advantages. The results of this study also show that the product prototypes of the present invention codes N, L, and R are all improved compared to the control product. The products of Example 6 and Example 5 are also "multiple insult fluid intake test) ”. The results are shown in Table 6. Multiple liquid absorption tests are to measure the time required for an adult incontinence pad to absorb liquid and the osmosis meter. The liquid absorption time is visually observed using a timer. The required suction for three liquids Time. The liquid used is a 0.9% by weight aqueous solution of degassed sodium deionized water, and it is doped with fine FD & C Blue # 1 dye to make the liquid more obvious. This test is usually at room temperature ( (Approximately 21 C). A pad of blotting paper is placed under each sample to collect the test solution that may overflow from the side of the product under test (incontinence pad). The instrument used in this test also includes A four-ounce capacity funnel, such as model 06122-20 from Cole-Parmer Instrument Company (wwwxoleparmer.com) or equivalent. In addition, a test board from a company (usually a 25.4 mm cylinder A plastic glass tray is placed on a shelf, and the sample under test is between the shelf and the shelf), surface | a stopwatch, a canister or a beaker to pour the liquid into a cylinder. For small samples, like the product used in Example 6, manually pour the liquid into a cylindrical tube on the test plate. Place the sample on the test plate to fix (press) it to prevent it from leaking. Pour 5 ml into the tube Liquid Moving code table. Record the time taken as soon as all the liquid is absorbed (visually). After one minute, perform the second round in the same way. After another minute, pour 5 ml of the third round. Each A sample of the product prototype of a code is tested with five samples, and the results are shown in Table 6. The older person indicates that this sample takes longer to fully absorb the added liquid. Usually the lesser time is better, because the product being tested at this time It will not leak when used. 36 C: \ Eunice 2004 \ PK-001-08 \ PK-001-0884 \ PK-001-0884-Tsuei.doc 200425917

—--- — pSc pSTS- average 2.1 standard deviation 0.1 average 2.7 standard deviation 0.3 average 2.0 standard deviation 0.2 average 2.7 average 4.3 average 5.0 average 6.8 standard deviation 1.5 average 4.1 standard deviation 0.5 average 5 standard deviation 0.4 average Π.2 standard deviation 2.5 Mean 4.7 Standard deviation 0.4 ¥ Mean 5 Standard deviation 0.3 · All time units are in seconds. —--- J

Day > The first test results show that the products of the three codes have similar absorption times, that is to say, the effect of the three is the same in terms of a single 5ml solution. In the second round, the code 匸 product started to take longer to absorb the liquid, and in the third round code c the product took longer to absorb. Therefore, the results of this test show that, in addition to the advantages mentioned above, the stability of the Jth layer = the code R, N, and L products of the absorption layer with a high-density second superabsorption layer can provide better liquid volume. Liquid absorption time. Although the description of the present invention is described in conjunction with the embodiments, it should be noted that various changes, improvements, and modifications can be easily seen by those skilled in the art with the above descriptions. Therefore, all changes, improvements, and amendments that meet the spirit and scope of the following patent applications should be considered to be included in the present invention. [Simplified description of 臞 style]

The first figure is a top view H view of an absorbent product such as a thin incontinence pad or a thin sanitary napkin, which is designed to absorb and retain urine and contains the absorbent core proposed by the present invention. The second figure is a cross-sectional view of the absorbent product shown in the first figure along the section line γ. The third figure is an enlarged schematic view of the first absorbing layer in the second figure. The fourth figure is the manufacturing equipment of the second absorption layer shown in the second figure. The fifth figure is a schematic diagram of a manufacturing process for manufacturing an absorbent core according to the present invention. The sixth figure is a cross-sectional view of one embodiment of the absorbent core according to the present invention. The seventh figure is a sectional view of another embodiment of the absorbent core according to the present invention. FIG. 8 is a cross-sectional view of another embodiment of the absorbent core according to the present invention. Figure 9 shows the equipment used to measure the liquid retention of an absorbent structure. 37 C: \ E «mce2 (X) 4 \ PK-W1-〇8 \ PK-〇〇i-〇 ^ 4 \ PKH〇Ol ^ 4-T5H« .iioc 200425917 [Simple description of unitary element] 10 Absorbent article Absorbing products 12 liner 14 Baffle 16 Absorbent core 18 Outer edge 20 Peripheral seal 22 Surge layer 24 First absorbent 26 Second absorbent 28 Fiber 28 Binder Adhesive 40 Garment adhesive 42 Peel strip Instant peeling film 100 Vacuum box Vacuum box 102 Rubber dam material Rubber shielding material 104 Screen screen 106 Vacuum gauge Vacuum gauge 108 Vacuum pump Vacuum pump 126 Drum former Drum former C: \ Ewnice2004 \ PK-001-08 \ PK-001-08S4 \ PK-001-0SS4-Tswri.doc 200425917 128 Forming chamber 130 Fabric web 132 Forming drum 134 Forming screen 135 Carrier tissue Conveyor 136 Nozzle Nozzle 137 Compaction roll 138 Heated nip 202 Roll reel 204 Cut unit Cutting unit 206 First conveyer 208 Timed cutting unit 210 Second conveyer 212 Finishing station 39 C: \ Eunice 2004 \ PK-001-08 \ PK-007-0884 \ PK-001-0884-Tsuei .doc

Claims (1)

200425917 Scope of patent application: L A wick that can be used in an absorbent product, which includes: a. A stable first absorbent layer; and b. Another second absorbent layer in close proximity to the first absorbent layer They are joined and contain 0) absorbent fibers treated with a non-fading density enhancer, and (ii) a superabsorbent material. 2. The absorbent core according to item 1 of the patent application, wherein the first absorbent layer includes absorbent fibers. 3. The absorbent core according to item 1 of the patent application, wherein the first absorbent layer includes a superabsorbent layer. 4. The absorbent core according to item 1 of the patent application scope, wherein the density of the second absorbent layer is souther than that of the first absorbent layer. 5. The absorbent core according to item 1 of the patent application range, wherein the first absorbent layer is vertically above the second absorbent layer when in use. 6. The absorbent core according to item 1 of the patent application scope, wherein the first absorbent layer is located vertically below the second absorbent layer when in use. 7. The absorbent core according to item 1 of the patent application scope, wherein the first absorbent layer is stable. The airlaid absorbent layer. 8. The absorbent core according to item 7 of the patent application scope, wherein the super absorbent content of the first absorbent layer is from 0 to about 60%. 9. The absorbent core according to item 1 of the patent application, wherein the density of the second absorbent layer is at least 015 g / cm3. 〇 · The absorbent core according to item 1 of the patent application scope, wherein the density of the second absorbent layer is at least 0.3 g / cm3. 11. The absorbent core according to item 1 of the patent application, wherein the durable density enhancer can form hydrogen bonds and may be a polymerized density enhancer, a non-polymerized density enhancer, or a mixture of the foregoing. 12. The absorbent core according to item 1 of the patent application, wherein the durable density enhancer is a high-boiling hydrogen bonding agent. 13. The absorbent core according to item 12 of the patent application, wherein the durable density enhancer is glycerin. 14. The absorptive core of the 12th item of the Shen Wei patent, wherein the durable density enhancer is a polymer having a molecular weight between 4000 and about 8000 g / mole. C: \ Eunice 2004) PK-001 ^) 8 \ PK-0〇7-〇884 \ PK-001-0884-Tsuei.doc 40 200425917 15. Absorbent core according to item 12 of the patent application, in which the durable density The enhancer is a polymer with a molecular weight greater than 8000 g / mole. 16. The absorbent core according to item 1 of the patent application scope, wherein the second absorbent layer contains 10% to 75% of a superabsorbent body. 17. The absorbent core according to item 1 of the patent application, wherein the combined thickness of the first absorbent layer and the second absorbent layer is about 5 mm or less. For example, the absorbent core according to item 1 of the patent application range, wherein the combined thickness of the first absorbent layer and the second absorbent layer is about 2 mm or less. Β. The absorbent core according to item 1 of the patent application, wherein the tensile strength of the first absorbent layer can reach at least 6 Newtons / 50 mm. 20. The absorbent core according to item 19 of the patent application range, wherein the tensile strength of the first absorbent layer when dry can reach at least 6 Newtons / 50 mm. 21. The absorbent core according to item 20 of the patent application, wherein the tensile strength of the first absorbent layer when wet is at least 2 Newtons / 50 mm. 22. The absorbent core according to item 19 of the patent application scope, wherein the tensile strength of the second absorbent layer when dry can reach at least 0.5 Newtons / 50 mm. 23 · —A wick that can be used in an absorbent product, which includes: a. —The first absorbent layer of a stable airflow mesh contains absorbent fibers, so that the first absorbent layer is tensile-resistant when dry. The strength is at least 6 Newtons / 50 mm and the tensile strength when wet is at least 2 Newtons / 50 mm; and, b. Another second absorbent layer is in close contact with the first absorbent layer and contains (1) a Absorptive fibers treated with density enhancers are not easily dissipated, and (ii) a superabsorbent material. Among them, a durable density enhancer can form hydrogen bonds and may be a polymerized density enhancer, a non-polymeric density enhancer, or a combination thereof. 24. If you apply for an absorbent core of item 23, the density of the second absorbent layer is south than the density of the first absorbent layer. 25. The absorbent core according to item μ of the patent application, wherein the durable density enhancer is glycerin. 26. For example, the absorbent core under the scope of the patent application No. 23, in which the second absorbent layer includes a jump to · C: \ Eunice 2004] PK-001-08 \ ΡΚ-ΟΟΊ-0884 \ PK-001-0884-Tsud. bc 41 200425917 super absorbent body. 27. For example, the absorbent core according to item 23 of the scope of patent application, wherein the thickness of the first absorbent layer and the second absorbent layer is about 5 mm or less. 28. If the scope of the patent application is item 23 An absorbent core in which the first absorbent layer is located vertically above the second absorbent layer in use. 29. For the absorbent core in item 23 of the patent application scope, wherein the first absorbent layer is located in the second absorbent layer when in use Vertically below. 30. An absorbent product, including: a.-An inner lining; b.-A separator; c. A stable first absorbent layer; d. Another second absorbent layer is adjacent to the first absorbent layer A super absorbent material is connected and contains absorbent fibers treated with a non-fading density enhancer. 31. The absorbent product according to item 30 of the patent application, in which the ^ absorbent layer is located in the inner lining. One side is vertically below, and the second absorption layer is under the first absorption 32. The absorbent product according to item 30 of the patent application, wherein the second absorbent layer is vertically below the first surface of the inner liner, and the first absorbent layer is vertically below the second absorbent layer. 33 · If the absorbent product in the scope of patent application No. 30, wherein the first absorbent layer contains absorbent fibers. 34 · If the absorbent product in the scope of patent application No. 33, where a durable density enhancer can form hydrogen bonds and may It is a polymerized density enhancer, a non-polymerized density enhancer, or a mixture of the above. 35. If the absorbent product under the scope of patent application No. 33, the durable density enhancer is a high > Fu point chlorine bond 36. The absorptive product according to item 33 of the patent application, wherein the durable density enhancer is glycerin. 37. The absorptive product according to item 36 of the patent application, wherein the second absorbent layer has a higher density than the first absorbent product. The layer is high. 38. The absorbent product according to item 36 of the patent application, wherein the density of the second absorbent layer is at least 0.15 g / cm3. 42 C- \ Eunice2m \ PK ^^ 8 \ PK ^ 1 ^ 884 \ PK <) 〇i ^ 884- TSuei.doc 200425917 39. For an absorbent product in accordance with item 36 of the patent application, wherein the density of the second absorbent layer is at least 0.3 g / cm3. 40. The absorbent product according to item 30 of the patent application, wherein the second absorbent layer contains 10% to 75% of a superabsorbent body. 41. For an absorbent product according to item 30 of the patent application, wherein the thickness of the first absorbent layer and the second absorbent layer is about 5 mm or less. 42. A method of manufacturing an absorbent core, the manufacturing method comprising: a. Obtaining a first absorbent raw material; b. Obtaining a second absorbent raw material, including (i) absorption treated with a non-fading density enhancer Fiber, and bait) ~ a super absorbent material. c · Cut the first absorbent raw material to make the first absorbent layer; d · Place the first absorbent layer next to the second absorbent layer; e · Cut the second absorbent material to make the second absorbent layer An absorbent core is formed as a whole. 43. The method of making a rim according to item 42 of the scope of patent application, further comprising: a. Obtaining an inner liner; and b. Obtaining a release sheet so that the absorbent core is positioned between the inner liner and the release sheet. 44. The manufacturing method according to item 43 of the patent application, wherein the absorbent core is arranged in such a manner that the inner liner is in close contact with the first absorbent layer. 43 C: \ Eunice 2004 \ ΡΚ-00Ί-08 \ ΡΚ ^ ΌΟί-0884 \ PK-001-0884-Tsuei.doc